Rook Ceph in DKP - Prerequisites

Important information you should know prior to using Rook Ceph in DKP

The Ceph instance installed by DKP is intended only for use by the logging stack and velero platform applications.

If you have an instance of Ceph that is managed outside of the DKP lifecycle, see Bring Your Own Storage to DKP Clusters.

If you do not plan on using any of the logging stack components such as grafana-loki , project-grafana-loki or velero for backups, then you do not need Rook Ceph for your installation and you can disable it by adding the following to your installer config file:

CODE

apiVersion: config.kommander.mesosphere.io/v1alpha1
kind: Installation
apps:
  ...
  ...
  grafana-loki:
    enabled: false
  ...
  rook-ceph:
    enabled: false
  rook-ceph-cluster:
    enabled: false
  ...
  velero:
    enabled: false
...

You must enable rook-ceph and rook-ceph-cluster if any of the following is true:

If grafana-loki is enabled.
If velero is enabled. If you applied config overrides for velero to use a storage that is external to your cluster, then you do not need Ceph to be installed.

For more information about Ceph, refer to the following:

Disabling Ceph during Upgrades (from DKP 2.3.x)

Up until DKP 2.3.x, MinIO was used as the default blob storage for DKP components. This has been replaced by Ceph from 2.4.x, therefore when you upgrade from 2.3.x -> 2.4.x, Ceph is automatically installed if any of the following are true:

minio-operator was installed (used by logging stack).
velero was installed (used for backups).

However, If you did not have minio-operator installed in 2.3.x and instead had configured velero to work with an external cloud storage such as Amazon S3 or Azure Blob Storage, then you do not need rook-ceph and rook-ceph-cluster post upgrade.

To explicitly disable installing these apps during upgrade, specify the following in the command line, then run the following command:

CODE

dkp upgrade kommander --disable-appdeployments rook-ceph,rook-ceph-cluster

The command above fails if minio-operator is installed as you cannot disable Ceph installation if minio-operator is installed.

See Rook Ceph Configuration for information on how you can configure Ceph for you Ceph Envirnoment.